src/gromacs/random/tests/uniformrealdistribution.cpp

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  35 /*! \internal \file
  36  * \brief Tests for GROMACS uniform real distribution
  37  *
  38  * \author Erik Lindahl <erik.lindahl@gmail.com>
  39  * \ingroup module_random
  40  */
  41 #include "gmxpre.h"
  42
  43 #include "gromacs/random/uniformrealdistribution.h"
  44
  45 #include <gtest/gtest.h>
  46
  47 #include "gromacs/random/threefry.h"
  48
  49 #include "testutils/refdata.h"
  50 #include "testutils/testasserts.h"
  51
  52 namespace gmx
  53 {
  54
  55 namespace
  56 {
  57
  58 TEST(UniformRealDistributionTest, GenerateCanonical)
  59 {
  60     gmx::test::TestReferenceData        data;
  61     gmx::test::TestReferenceChecker     checker(data.rootChecker());
  62
  63     gmx::ThreeFry2x64<8>                rng(123456, gmx::RandomDomain::Other);
  64     std::vector<real>                   result;
  65
  66     for (int i = 0; i < 10; i++)
  67     {
  68         result.push_back(gmx::generateCanonical<real, std::numeric_limits<real>::digits>(rng));
  69     }
  70     checker.checkSequence(result.begin(), result.end(), "GenerateCanonical");
  71 }
  72
  73 TEST(UniformRealDistributionTest, Output)
  74 {
  75     gmx::test::TestReferenceData            data;
  76     gmx::test::TestReferenceChecker         checker(data.rootChecker());
  77
  78     gmx::ThreeFry2x64<8>                    rng(123456, gmx::RandomDomain::Other);
  79     gmx::UniformRealDistribution<real>      dist(1.0, 10.0);
  80     std::vector<real>                       result;
  81
  82     for (int i = 0; i < 10; i++)
  83     {
  84         result.push_back(dist(rng));
  85     }
  86     checker.checkSequence(result.begin(), result.end(), "UniformRealDistribution");
  87 }
  88
  89 TEST(UniformRealDistributionTest, Logical)
  90 {
  91     gmx::ThreeFry2x64<8>                rng(123456, gmx::RandomDomain::Other);
  92     gmx::UniformRealDistribution<real>  distA(2.0, 5.0);
  93     gmx::UniformRealDistribution<real>  distB(2.0, 5.0);
  94     gmx::UniformRealDistribution<real>  distC(3.0, 5.0);
  95     gmx::UniformRealDistribution<real>  distD(2.0, 4.0);
  96
  97     EXPECT_EQ(distA, distB);
  98     EXPECT_NE(distA, distC);
  99     EXPECT_NE(distA, distD);
 100 }
 101
 102
 103 TEST(UniformRealDistributionTest, Reset)
 104 {
 105     gmx::ThreeFry2x64<8>                             rng(123456, gmx::RandomDomain::Other);
 106     gmx::UniformRealDistribution<real>               distA(2.0, 5.0);
 107     gmx::UniformRealDistribution<real>               distB(2.0, 5.0);
 108     gmx::UniformRealDistribution<real>::result_type  valA, valB;
 109
 110     valA = distA(rng);
 111
 112     distB(rng);
 113     rng.restart();
 114     distB.reset();
 115
 116     valB = distB(rng);
 117
 118     // Use floating-point test with no tolerance rather than exact
 119     // test, since the later fails with 32-bit gcc-4.8.4
 120     EXPECT_REAL_EQ_TOL(valA, valB, gmx::test::ulpTolerance(0));
 121 }
 122
 123 TEST(UniformRealDistributionTest, AltParam)
 124 {
 125     gmx::ThreeFry2x64<8>                            rngA(123456, gmx::RandomDomain::Other);
 126     gmx::ThreeFry2x64<8>                            rngB(123456, gmx::RandomDomain::Other);
 127     gmx::UniformRealDistribution<real>              distA(2.0, 5.0);
 128     gmx::UniformRealDistribution<real>              distB; // default parameters
 129     gmx::UniformRealDistribution<real>::param_type  paramA(2.0, 5.0);
 130     gmx::UniformRealDistribution<real>::result_type valA, valB;
 131
 132     EXPECT_NE(distA(rngA), distB(rngB));
 133     rngA.restart();
 134     rngB.restart();
 135     distA.reset();
 136     distB.reset();
 137
 138     valA = distA(rngA);
 139     valB = distB(rngB, paramA);
 140
 141     // Use floating-point test with no tolerance rather than exact test,
 142     // since the latter fails with 32-bit gcc-4.8.4
 143     EXPECT_REAL_EQ_TOL(valA, valB, gmx::test::ulpTolerance(0));
 144 }
 145
 146 }      // namespace anonymous
 147
 148 }      // namespace gmx